It just uses the python function array.index() and with a simple Try / Except it returns the position of the record if it is found in the list and return -1 if ... ... <看更多>

Lists elements can be accessed using a numerical index in square brackets. This is the same technique that ... ... <看更多>

The index -1 is a special index that always refers to the last item of the list. Similarly, we can use other negative numbers to count backwards from the end of ... ... <看更多>